Compressor cycling fix
06-12-2018, 02:12 PM
#1151
Senior Member
If you are just using a resistor or a pot switch: use the middle post and either left or right on the pot. On the resistor, there are only 2 sides to use. Regarding the wires that go into the temperature probe, you place the wires from the pot switch, in the plug, one on each side of the sides. same for the resistor.
It stays in the loop, the resistor or pot is adding to what the temp probe is reading based on a whole host of things. Look at post 767
Last edited by digitaltrucker; 06-12-2018 at 02:15 PM.
06-13-2018, 04:40 PM
#1152
Senior Member
100 degrees out with a feels like at 105, ac set at 73, no max and no recirc on and vent discharge is 40 degrees! on the donor truck today!
06-13-2018, 05:49 PM
#1153
Senior Member
Sure will be glad to have this "HACK" in my truck when I leave shortly!
06-17-2018, 07:43 PM
#1154
Can’t thank everyone enough for this mod. Living in South Florida, you know what I mean. I’ve had issues with the truck even though it has only 44 k miles. Breaks, water pump,3 batteries, electric locking rear end switch. But when summer comes this mod keeps me from selling it. The FX4 is loaded and I really enjoy the ride....this A.C. Mod makes driving it a pure pleasure in the summer. Cold A.C. and cold seats make all the difference. Thank everyone for the hard work to correct what Ford screwed up on.
06-26-2018, 02:46 PM
#1155
Senior Member
Finally got my pot dialed in. Set it at 400k. This produces 39.5-41.3 center vent temps on max and speed 3 in 107 degree outside temp. In traffic it will hold right around 40.5. First time in summer I’ve actually been cold in my truck 
.
Thanks to those of you that found this!
. Thanks to those of you that found this!
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digitaltrucker (06-26-2018)
06-27-2018, 01:05 PM
#1156
Senior Member
In AZ at 107 degF it is pretty dry so you probably will not freeze your coil. But if you drive into a more humid climate, be careful. With an outlet air temp around 40 deg, the coil temp could be 30 deg.
And that's at high speed fan. The coil may freeze when you drop the fan speed down.
And that's at high speed fan. The coil may freeze when you drop the fan speed down.
06-28-2018, 10:19 AM
#1157
Senior Member
An update on mine.
Been running a 680 resistor in my 2013 since 2015.
I get center vent temps of 38-40, low speed, no recirc
Have not removed the resistor since installed. Have not had any freezing issues.
Amazing how each truck reacts a little different to different resistors specs
Been running a 680 resistor in my 2013 since 2015.
I get center vent temps of 38-40, low speed, no recirc
Have not removed the resistor since installed. Have not had any freezing issues.
Amazing how each truck reacts a little different to different resistors specs
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digitaltrucker (06-28-2018)
07-01-2018, 11:05 AM
#1158
Senior Member
After reading all of this, decided to try myself. 1M ohm potentiometer set at 400k ohms does the trick for me. Here in Fort Worth, seems like if its about 100-101 outside I can have the vent temps around 40F while cruising if I have it on speed 2 or 3 recirc. Before I couldn't get the temps below 48F. I do have the suction line insulated with some armaflex in the engine bay so that helps with a degree or two. Thanks to those who figured this out, it really helps here in the Texas heat!
07-01-2018, 02:21 PM
#1159
Senior Member
After reading all of this, decided to try myself. 1M ohm potentiometer set at 400k ohms does the trick for me. Here in Fort Worth, seems like if its about 100-101 outside I can have the vent temps around 40F while cruising if I have it on speed 2 or 3 recirc. Before I couldn't get the temps below 48F. I do have the suction line insulated with some armaflex in the engine bay so that helps with a degree or two. Thanks to those who figured this out, it really helps here in the Texas heat!
07-04-2018, 10:01 AM
#1160
Senior Member
Interesting I wonder if
In this thread, https://www.f150forum.com/f38/new-ac...iginal-420334/ , the guy claims that prior to a compressor replacement, his ac would freeze him out. Now after a new compressor was installed, his ac performance is poor and similar to a lot of ours.
Just wondering if there were maybe 2 compressors, initially, that Ford used? But not sure how a compressor would adversely impact our systems?
Any one have any thoughts about this? I dont know how the compressor would impact the cycle scheme by its self.
Just wondering if there were maybe 2 compressors, initially, that Ford used? But not sure how a compressor would adversely impact our systems?
Any one have any thoughts about this? I dont know how the compressor would impact the cycle scheme by its self.